I (unfortunately) use beanstalkd, and it seems to be pretty dead, at least on the Java client side. My question is why to we even need a 'background job' syste

I (unfortunately) use beanstalkd, and it seems to be pretty dead, at least on the Java client side. My question is why to we even need a 'background job' system, isn't this just a message broker / queue? RabbitMQ (and friends) can do much of this, no? Maybe I'm missing some of the future features they aim to implement.